Shopify speed optimization, for the phones your shoppers actually have.
Most of your shoppers are on a phone, and most phones are slow. What makes a Shopify store slow, what makes it fast, and how to measure it before and after.
Why speed is a sales number
Three in four shoppers arrive on a phone (Nosto, 2025), and the typical one is a $250 Android more than three times slower than a current iPhone (Alex Russell, 2026). In Google and Deloitte’s study of 37 brands, a mobile site a tenth of a second faster converted 8.4% more retail shoppers (web.dev). A store that feels fine on your phone can be slow on theirs.
What makes a Shopify store slow
- Apps. Each one can load its own scripts on every page, and an uninstalled app can leave its code behind in the theme.
- Images. A photo uploaded at full size and shown small, or the first image on the page loading late.
- The theme. A theme built for every store ships every feature to yours, used or not.
- Page builders. They add their own code on top of the theme’s.
- Third-party scripts. Chat, reviews, analytics and ads, each with its own weight.
How to measure it
- Google’s PageSpeed Insights, on mobile, for a product page, a collection and the home page. The top of the report is what real Chrome visitors got over 28 days; below it is a lab test you can rerun.
- Our free store audit runs both in about a minute and saves the results on a link.
- Measure before you change anything, so you can see what worked.
How we make it fast
The biggest fix is the theme itself. A new theme on our core loads only what your store uses, and it’s measured frame by frame on a slow phone. Every claim is in the technical spec, with how to check it. It comes with a guarantee: a higher mobile PageSpeed score than your current theme, same pages and same apps, or we keep tuning at no charge.
After launch, a speed bundle keeps it there: images sized and loaded in the right order, the app stack audited and pruned, and a Core Web Vitals pass on your busiest product page.
FAQ. Straight answers.
Why is my Shopify store slow?
Usually the product page: apps loading their scripts on every page, images bigger than they’re shown, and a theme that ships every feature for every store. The home page can look fine while the product page is where shoppers wait.
Do speed apps work?
Some delay scripts so a test scores better, without the page doing less. The lasting fix is less to load: fewer apps, right-sized images, and a theme that only ships what your store uses.
Does Klaviyo slow the store?
It can, if its script is in the theme twice or sits on a page that’s already heavy. One copy, loaded the way Klaviyo recommends, costs little.
Which pages should we test?
A product page, a collection and the home page, on mobile. Most sales start on a product page, and that’s usually the slowest.